'Blind Guides' in the Bible

Ponder these things once in your mind, and wonder: Blinded are they themselves, and the blind guides of others; they are drunken, but not with wine; they are unstable, but not through strong drink.

Let them alone: they are blind guides. And if the blind guide the blind, both shall fall into a pit.

Woe unto you, ye blind guides, which say, Whosoever shall swear by the temple, it is nothing; but whosoever shall swear by the gold of the temple, he is a debtor!

Ye blind guides, which strain at a gnat, and swallow a camel.